[Bug 259249] vtnet: Checksum offloading enabled reduces pf NAT performance (~100mbps -> ~200kbps)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259249

vova@fbsd.ru changed:

           What    |Removed                     |Added
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                 CC|                            |vova@fbsd.ru

--- Comment #4 from vova@fbsd.ru ---
As fast as as I have testing stand (see #276760), I've re-measured in NATed
jail 

and here clear degradation of download for 14.3p4 with offloading if compare
with 
14-stable or no offloading 

~26 Mbps vs ~800 Mbps normally


FreeBSD Offloading      Download (CV%)  delta %         Upload (CV%)    delta %
14.3p4          yes     26      19.96%                   445    19.96%  
14.3p4          no      813     23.93%  3079%            528    23.93%  19%
14-087fc6ae0a8c yes     489     58.95%  -40%             431    58.95%  -18%
14-087fc6ae0a8c no      762     33.78%  56%              570    33.78%  32%


raw data:
FreeBSD Offloading      Try     Download        Upload

14.3p4          yes     1        21      54 
14.3p4          yes     2        18      769 
14.3p4          yes     3        20      315 
14.3p4          yes     4        28      540 
14.3p4          yes     5        33      495 
14.3p4          yes     6        27      356 
14.3p4          yes     7        32      421 
14.3p4          yes     8        22      325 
14.3p4          yes     9        28      451 
14.3p4          yes     10       27      728 
14.3p4          yes     avg      26      445 
                CV%     19.96%  46.73%

14.3p4          no      1        932     686 
14.3p4          no      2        749     433 
14.3p4          no      3        854     441 
14.3p4          no      4        885     624 
14.3p4          no      5        946     760 
14.3p4          no      6        284     211 
14.3p4          no      7        916     754 
14.3p4          no      8        863     462 
14.3p4          no      9        883     416 
14.3p4          no      10       816     496 
14.3p4          no      avg      813     528 
                CV%     23.93%  33.02%

14-087fc6ae0a8c yes     1        87      510 
14-087fc6ae0a8c yes     2        537     763 
14-087fc6ae0a8c yes     3        884     576 
14-087fc6ae0a8c yes     4        714     414 
14-087fc6ae0a8c yes     5        379     392 
14-087fc6ae0a8c yes     6        724     441 
14-087fc6ae0a8c yes     7        259     563 
14-087fc6ae0a8c yes     8        758     474 
14-087fc6ae0a8c yes     9        60      48 
14-087fc6ae0a8c yes     10       484     128 
14-087fc6ae0a8c yes     avg      489     431 
                CV%     58.95%  48.74%

14-087fc6ae0a8c no      1        964     541 
14-087fc6ae0a8c no      2        943     410 
14-087fc6ae0a8c no      3        980     478 
14-087fc6ae0a8c no      4        981     761 
14-087fc6ae0a8c no      5        861     757 
14-087fc6ae0a8c no      6        874     537 
14-087fc6ae0a8c no      7        765     471 
14-087fc6ae0a8c no      8        596     510 
14-087fc6ae0a8c no      9        327     511 
14-087fc6ae0a8c no      10       328     728 
14-087fc6ae0a8c no      avg      762     570 
                CV%     33.78%  22.59%

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